A magnetic moment is a ____ ?
A. vector quantity.
B. scalar quantity.
C. pole strength.
D. universal constant.
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Which of the following uses temporary magnets ?
A. Motors
B. Hoist
C. Generators
D. All of them
___ is the most detrimental impurity in the magnetic materials ?
A. Oxygen
B. Nitrogen
C. Carbon
D. Sulphur
Which of the followings is/are active element?
A. Voltage source
B. Current source
C. Both
D. None of these.